When an OS is out of support, when a vulnerability is found, it’s not fixed. Those vulnerabilities probably exist in newer operating system, but no one has found them and if they are found they will be fixed.
A zero day vulnerability can sell for millions because they are so hard to find. If you find one and know where to look, you can sell the knowledge. Just to give you an idea of how hard they are to find. So an older OS, in addition to being out of support, also has had more time to find these issues.
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